# netintel.dev GPT-5.1 Pay-Per-Call Gateway

> netintel.dev GPT-5.1 Pay-Per-Call Gateway is a paid API for AI agents from netintel.dev, paid per call via x402, $0.15/call, status unknown (last checked 2026-09-13).

Proxies OpenAI GPT-5.1 chat completions via a pay-per-call x402 endpoint at $0.15 USDC per request — no OpenAI account or API key required.

## Facts

- Endpoint: POST https://netintel.dev/openai/gpt-5-1
- Price: $0.15/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/netintel-dev-gpt-5-1-pay-per-call-gateway-23bda79f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fmUitMaPthxGm7tcpZW0F

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability netintel-dev-gpt-5-1-pay-per-call-gateway-23bda79f -d '<json body>'
```

Example prompt: Ask GPT-5.1 to write a detailed explanation of how transformers work in machine learning — keep the response under 500 words and aimed at a software engineer who hasn't studied ML.

## When to prefer this

Choose this endpoint when you need GPT-5.1 specifically (the latest OpenAI flagship model) on a pay-per-call basis without managing an OpenAI account, API keys, or subscription. Ideal for agents making occasional or unpredictable LLM calls, cost-sensitive pipelines that want per-call USDC billing, or sandboxed environments where storing API credentials is undesirable. Prefer GPT-4o or GPT-4.1 siblings on the same gateway if GPT-5.1 pricing or capability is more than needed.

## Known failure modes

- Insufficient USDC balance or x402 payment failure — payment required error
- Input exceeds ~96000 character cap — request rejected
- max_completion_tokens set above 4096 — capped or rejected
- Malformed messages array (missing role or content) — validation error
- OpenAI upstream outage or rate limit — 502 or 503 error

## How this service works

Call OpenAI's gpt-5.1 via a single pay-per-call x402 endpoint — no OpenAI account or API key needed, pay $0.15 per request in USDC. Standard OpenAI chat.completions request/response shape, capped input and output. Search terms: OpenAI, gpt-5.1, chat completion, LLM, no API key.

## Output

Returns a standard OpenAI chat.completion JSON object including an id, model name, created timestamp, choices array (with the assistant's message content and finish_reason), and a usage object detailing prompt_tokens, completion_tokens, and total_tokens. Output is capped at 4096 tokens.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "messages"
     ],
     "properties": {
      "messages": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "role",
         "content"
        ],
        "properties": {
         "role": {
          "type": "string",
          "description": "system, user, or assistant"
         },
         "content": {
          "type": "string",
          "description": "Message text"
         }
        }
       },
       "description": "OpenAI chat messages: [{role:'system'|'user'|'assistant', content:string}]. Input capped ~96000 chars total."
      },
      "max_completion_tokens": {
       "type": "number",
       "description": "Max output tokens. Optional — defaults to 4096, capped at 4096."
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "id": {
       "type": "string"
      },
      "model": {
       "type": "string"
      },
      "usage": {
       "type": "object",
       "description": "prompt_tokens, completion_tokens, total_tokens"
      },
      "object": {
       "type": "string",
       "description": "Always 'chat.completion'"
      },
      "choices": {
       "type": "array",
       "description": "Assistant message + finish_reason."
      },
      "created": {
       "type": "number",
       "description": "Unix timestamp (seconds)"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-abc123",
  "model": "gpt-5.1",
  "usage": {
   "total_tokens": 13,
   "prompt_tokens": 11,
   "completion_tokens": 2
  },
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "Hi!"
    },
    "finish_reason": "stop"
   }
  ],
  "created": 1735689600
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/netintel-dev-gpt-5-1-pay-per-call-gateway-23bda79f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from netintel.dev](https://www.zero.xyz/host/netintel.dev/llms.txt)